I used to use a darkroom (in high school) that had a double door
arrangement.  What made this effective was that the doors had plywood
sectors mounted to the bottom, interfaced with a cut out plywood recess
in the floor between doors, such that only one door could be open (even
just a crack) at a time.  To enter the darkroom, you'd push open the
outer door, step into the tiny vestibule, let the door close behind you
(the doors swung into the vestibule, with spring closers), and then open
the second door and enter the darkroom.  Coming out worked the same way.

This was built by the photography instructor, I believe, and could be
recreated by any reasonably competent homeowner grade carpenter (I could
probably make one myself, and likely will once I have a permanent
darkroom of my own) for the cost of materials and hardware, and with
less effort than simply installing one of those rotating cylinder doors.

Bringing large items into and out of the darkroom is still best handled
with a second light sealed door, preferably with a deadbolt lock that
requires a key from both sides.

In the old days, back when I was at college :-( where I first got
the two door idea:

We had a light which came on when someone entered from the other
side....there were two lights,.... one on each room side of the
"airlock".

 With that much room you may be able to achieve a maze effect
with rearangment of the darkroom equipment and one 2x7 foot sheet
of plywood.
 Keep in mind that it is what your photosensitive materials see.
What you see is of no consequence. I see light leaks in my darkroom
which I think might fog film. I do not handle film where it can see
those leaks. Paper with it's little sensitivity is immune to a
little white light. My guess; you worry too much.               Dan

Maybe you could re-arrange things a bit... or not. Just so you're sure
what I was talking about, I drew a quick sketch. BTW, this was in a
basement; there was a small anteroom at the bottom of the steps before
entering the maze.